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THE DENVER COMPLEX Ouse Washes Cut Off Channel Diversion Sluice Great Ouse Tidal Relief Channel 100 foot River Denver Slui...
The Ely Ouse to Essex Transfer Scheme
The Abberton Scheme Denver Variation Enlarged Abberton Reservoir Transfer Enhancement
 
 
 
 
 
 
Abberton Reservoir Enlargement <ul><li>Main dam to be raised - maximum water levels increased by 3.2m </li></ul><ul><li>St...
 
 
B1026 Causeway
B1026 road diversion <ul><li>2km of road diversion. </li></ul><ul><li>3 new car parks. </li></ul><ul><li>New drainage syst...
 
 
 
 
Main Dam <ul><li>Main Dam to be raised by 3.2m and footprint enlarged. </li></ul><ul><li>Material placed on downstream fac...
Enabling Works <ul><li>Diversion of Langham main – 27” x 2km. </li></ul><ul><li>Diversion of high pressure gas main – 3km ...
Environmental Enhancements <ul><li>The Reservoir is designated as a Site of Special Scientific Interest, a Special Protect...
 
Risks <ul><li>Cold weather working – restrictions due to wildfowl and designations. </li></ul><ul><li>Edge removal – wildf...
Timescale <ul><li>Planning decision in 2009 </li></ul><ul><li>Pipeline construction 2011-2012  </li></ul><ul><li>Reservoir...
 
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Abberton ICE Meeting

Copy of presentation slides from ICE evening meeting on 9th march 2010 at the Ramad Hotel in Colchester.

Jim Jenkins of Essex and Suffolk Water outlined the Abberton Scheme and went on to talk in more detail about the raising of Abberton Reservoir itself

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Abberton ICE Meeting

  1. 3. THE DENVER COMPLEX Ouse Washes Cut Off Channel Diversion Sluice Great Ouse Tidal Relief Channel 100 foot River Denver Sluice Ten Mile River - Ely Ouse To Essex
  2. 4. The Ely Ouse to Essex Transfer Scheme
  3. 5. The Abberton Scheme Denver Variation Enlarged Abberton Reservoir Transfer Enhancement
  4. 12. Abberton Reservoir Enlargement <ul><li>Main dam to be raised - maximum water levels increased by 3.2m </li></ul><ul><li>Storage volume to increase by 58% </li></ul><ul><li>Surface Area to increase from 4.7 km 2 to 6.6 km 2 </li></ul><ul><li>Four smaller Col dams required. </li></ul><ul><li>Essex Wildlife Trust visitor centre to be relocated </li></ul><ul><li>Removal of much of the concrete edge </li></ul><ul><li>Repositioning of existing intake & raising of spillway </li></ul><ul><li>Creation of 2 borrow pits </li></ul><ul><li>Modifying B1026 causeway, blocking off the culvert & a new over pumping facility </li></ul><ul><li>Diversion of the B1026 </li></ul>
  5. 15. B1026 Causeway
  6. 16. B1026 road diversion <ul><li>2km of road diversion. </li></ul><ul><li>3 new car parks. </li></ul><ul><li>New drainage system, swales and retention ponds with oil interceptors. </li></ul><ul><li>New entrances to EWT visitor centre, perimeter road and Rows Farm. </li></ul>
  7. 21. Main Dam <ul><li>Main Dam to be raised by 3.2m and footprint enlarged. </li></ul><ul><li>Material placed on downstream face with clay core off-set. </li></ul><ul><li>Material – clay and gravel - to be sourced from borrow pits on-site. </li></ul><ul><li>Borrow pits will be reinstated or included in raised reservoir. </li></ul><ul><li>Valve Tower to be raised. </li></ul><ul><li>Existing inlet works to be relocated. </li></ul>
  8. 22. Enabling Works <ul><li>Diversion of Langham main – 27” x 2km. </li></ul><ul><li>Diversion of high pressure gas main – 3km </li></ul><ul><li>Diversion of low pressure gas main – 1km. </li></ul><ul><li>Diversion of 11kv overhead lines. </li></ul><ul><li>Diversion of 33kv overhead lines. </li></ul><ul><li>Stabilisation of 132kv pylon. </li></ul>
  9. 23. Environmental Enhancements <ul><li>The Reservoir is designated as a Site of Special Scientific Interest, a Special Protection Area under the Habitats Regulations and a Ramsar site. These designations are because of the number and species of waterfowl and other birds that the Reservoir supports. </li></ul><ul><li>The enlargement of the Reservoir will enhance the value of the site for water birds. </li></ul><ul><li>Creation of areas of shallow water habitat </li></ul><ul><li>New natural edge </li></ul><ul><li>More constant water levels in west and central reservoirs </li></ul><ul><li>Creation of 5ha wetlands at the west of the reservoir </li></ul>
  10. 25. Risks <ul><li>Cold weather working – restrictions due to wildfowl and designations. </li></ul><ul><li>Edge removal – wildfowl disturbance/ limited working periods. </li></ul><ul><li>Delayed start due to approvals. </li></ul><ul><li>Archaeology on Kirtling Green – Wixoe pipeline. </li></ul><ul><li>Construction activities required at lowered water levels. </li></ul><ul><li>Delays with utility diversions. </li></ul><ul><li>Unforeseen ground conditions. </li></ul><ul><li>Results of Risk Workshop. </li></ul>
  11. 26. Timescale <ul><li>Planning decision in 2009 </li></ul><ul><li>Pipeline construction 2011-2012 </li></ul><ul><li>Reservoir raising 2010-2013 </li></ul><ul><li>Reservoir filling 2013-2014 </li></ul><ul><li>Raised reservoir in use 2014 </li></ul>Programme milestones

Copy of presentation slides from ICE evening meeting on 9th march 2010 at the Ramad Hotel in Colchester. Jim Jenkins of Essex and Suffolk Water outlined the Abberton Scheme and went on to talk in more detail about the raising of Abberton Reservoir itself

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